import java.util.*;
public class PP2_2{
    public static void main(String[] args){
        int num1,num2,num3;
        float average;
        Scanner scan = new Scanner(System.in);
        num1=scan.nextInt();
        num2=scan.nextInt();
        num3=scan.nextInt();
        average=(float)(num1+num2+num3)/3;
        System.out.println("The average is:"+average);
}}
